Planting a little lawn in a coworker’s keyboard is a nice way to welcome him back from vacation.

Step 1: Wait for a good time

Find a time when a coworker is going to be out of the office for at least two weeks—maybe when he’s on that romantic honeymoon.

Step 2: Spray their keyboard

Spray his keyboard—or an old one you don’t mind ruining—with water.

Step 3: Sprinkle in seeds

Sprinkle cat-grass seeds in the cracks between the keys.

Step 4: Cover

Cover the keyboard with plastic wrap. You want things to get nice and moist.

Step 5: Light it

Place the keyboard by a window, where it will get plenty of sunlight.

Step 6: Enjoy!

Enjoy the look on your coworker’s face when he comes back from his holiday to find several inches of grass growing out of his keyboard!